{
  "annotation_id": "081cc34f-d5a0-4c6f-861a-453a23fa1b93",
  "date_created": "2026-03-02T18:01:52.555000Z",
  "date_modified": "2026-03-02T18:01:52.555000Z",
  "file_hash": "7f523925190dc6c4675479c48c0862416b09cdbeedc317a347a6f799171cfab1",
  "private": false,
  "record": {
    "abstract": "We analyze a quantum measurement where the apparatus is initially in a mixed\nstate. We show that the amount of information gained in a measurement is not\nequal to the amount of entanglement between the system and the apparatus, but\nis instead equal to the degree of classical correlations between the two. As a\nconsequence, we derive an uncertainty-like expression relating the information\ngain in the measurement and the initial mixedness of the apparatus. Final\nentanglement between the environment and the apparatus is also shown to be\nrelevant for the efficiency of the measurement.",
    "arxiv_id": "quant-ph/0207116",
    "authors": [
      "V. Vedral"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.90.050401",
    "journal_ref": "Phys. Rev. Lett. 90 (5), 050401 (2003)",
    "title": "Classical Correlations and Entanglement in Quantum Measurements",
    "url": "https://arxiv.org/abs/quant-ph/0207116"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "3cd35cce-b7d2-4709-b5e2-ede71cf71f55",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}